<template>
    <div>
    <!-- 面包屑导航条位置 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>
        <!-- 卡片内容区域 -->
        <el-card class="box-card" >

        <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon>
        </el-alert>
        <!-- 步骤条 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
        </el-steps>

        <!-- 添加商品填写信息栏 -->
        <el-form :model="addForm" :rules="addFormrules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs :tab-position="'left'"  v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">  
                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number" type="number"></el-input>
                </el-form-item>

                <!-- 选择商品分类区域 -->
                <el-form-item label="商品分类" prop="goods_cat">
                        <!-- 分类选择框 -->
                        <el-cascader     
                            clearable
                            :props="cascaderProps"
                            :options="cateList"                    
                            v-model="addForm.goods_cat"
                            prop="goods_cat"
                            @change="handleChange">
                        </el-cascader> 
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                    <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
                    </el-checkbox-group>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                    <el-checkbox-group v-model="item.attr_vals">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-checkbox-group>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
                <!-- 图片上传 action表示要上传的地址 -->
                <el-upload
                :headers="headersObj"
                class="upload-demo"
                action="http://127.0.0.1:8888/api/private/v1/upload"
                :on-preview="handlePreview"
                :on-remove="handleRemove" 
                :on-success="handleSuccess"               
                list-type="picture">
                    <el-button size="small" type="primary">点击上传</el-button>
                    <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
                <quill-editor v-model="addForm.goods_introduce">
                </quill-editor>
                <el-button type="primary" class="addBtn" @click="addShop">添加商品</el-button>
            </el-tab-pane>
        </el-tabs>
        </el-form>

        </el-card>

        <!-- 预览图片对话框 -->
        <el-dialog
        title="图片预览"
        :visible.sync="dialogVisible"
        >
        <img :src="previewPath" alt="" width="100%">
        </el-dialog>
    
    </div>
</template>

<script>
import _ from 'lodash'
export default {

    data() {
        return {
            headersObj: {
                Authorization: window.sessionStorage.getItem('token')   
            },
            //这是获取到的商品参数数据
            manyTableData: [],
            onlyTableData: [],
            
            //父级选择框的渲染数据
             cateList: [],
            
            //指定选择器的配置对象
            cascaderProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: "hover",               
            },
            activeIndex: '0',
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                //双向绑定选择框的数据
                goods_cat: [],
                pics: [],
                goods_introduce: '',
                attrs: []
            },
            addFormrules: {
                goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' },
                ],
                goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' },
                ],
                goods_weight: [
                    { required: true, message: '请输入商品重量', trigger: 'blur' },
                ],
                goods_number: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' },
                ],
                goods_cat: [
                    { required: true, message: '请选择商品分类', trigger: 'blur' },
                ],

            },
            previewPath: '',
            dialogVisible: false
        };
    },
    created () {
        this.getCateList()
    },
    methods: {
         async getCateList () {
          const {data: res} = await this.$http.get('categories')
          if(res.meta.status !== 200) return this.$message.error('获取商品分类数据失败')
            this.cateList = res.data           
        },
        handleChange () {
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
                return 
            } 
        },
        //检测是否填写了信息才能切换tabs标签
       beforeTabLeave (actName,oldActName) {
            // console.log('即将进入'+actName)
            // console.log('即将离开'+oldActName)
            if(oldActName === '0' && this.addForm.goods_cat.length !== 3){
            this.$message.error('请选择商品分类')
            return false
            }
        },
        //这是tabs的事件方法
        async tabClicked () {
            if(this.activeIndex === '1'){
                //你如果点击的是商品参数，就获取数据
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params: {sel: 'many'}})
            if(res.meta.status !== 200) return this.$message.error('获取参数失败')
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
            })
            this.manyTableData = res.data
            }

            if(this.activeIndex === '2'){
                //获取静态属性
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params: {sel: 'only'}})
                if(res.meta.status !== 200) return this.$message.error('获取参数失败')
                this.onlyTableData = res.data
            }
            
        },
        //图片预览操作
        handlePreview (file) {
            console.log(file)
            this.previewPath = file.response.data.url
            console.log(this.previewPath)
            this.dialogVisible = true
        },
        //移除图片操作
        handleRemove (file) {
            // console.log(file)拿到临时路劲，找到索引值，根据索引值删除数组
            
            const filePath = file.response.tmp_path

            const i = this.addForm.pics.findIndex(x => {
                x.pic === filePath
            })
            this.addForm.pics.splice(i, 1)

        },
        //上传成功的钩子函数
        handleSuccess (res) {
            const picInfo = {
                pic: res.data.tmp_path
            }
            //将图片信息push到数组中
            this.addForm.pics.push(picInfo)
            // console.log(this.addForm.pics)
        },
        //添加商品
        addShop () {
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid) return this.$message.error('请填写必要的表单项')
            //先处理数据，然后提交
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            //处理动态参数，静态属性
            this.manyTableData.forEach(item => {
                const newInfo = {
                    attr_id: item.attr_id,
                    attr_value: item.attr_vals.join(' ')
                    }

                this.addForm.attrs.push(newInfo)
            })
            this.onlyTableData.forEach(item => {
                const newInfo ={
                    attr_id: item.attr_id,
                    attr_value: item.attr_vals
                }
                this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
            // console.log(form)
            //添加商品，名称必须是唯一的
                const {data: res} = await this.$http.post('goods',form)
                if(res.meta.status !== 201) {
                    return this.$message.error('添加商品失败')
                }
                this.$message.success('添加商品成功')

                this.$router.push('/goods')
                this.addForm = []
            })
            //执行添加的业务逻辑
            //要先将goods_cat数组改成字符串
            // this.addForm.goods_cat = this.addForm.goods_cat.join(',') 这种方法会报错
            // 采用深拷贝不影响原对象，建立一个新的对象 lodash  cloneDeep(obj)
            
        }
    },
    computed: {
        cateId () {
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
};
</script>

<style lang="scss">
.el-steps {
    margin: 15px 0;
}
.el-step__title {
    font-size: 13px;
}
.el-cascader{
    width: 40%;
}
.el-checkbox {
    margin:0 5px 0 0 !important;
}
.addBtn{
    margin: 10px 5px !important;
}
</style>
